I have a friend with Hashimoto's Thyroiditis. In recent years several studies have found a potential connection between Hashimoto's and celiac disease (it is still being actively studied, and the link is not conclusive), and so some doctors are beginning to suggest that people with Hashimoto's remove gluten from their diet. My friend did, and sure enough saw some thyroid improvement afterward. She is now entirely gluten free (and has been for over a year), and is often irritated at people judging or questioning her gluten-free diet because they immediately assume it is nothing more than capitulation to an idiotic fad.